Medical oxygen generator with pressure swing adsorption (PSA) technology as the foundation, to extract oxygen from the air of the new equipment, the use of molecular sieve physical adsorption and desorption technique in molecular sieve oxygen generator in loading, when the pressure in the air can be nitrogen adsorption, the remaining unabsorbed oxygen is collected, become namely after purification treatment of high purity oxygen. The specific working process is that the compressed air is purified by the air purification dryer and then enters the adsorption tower through the switching valve. In the adsorption tower, nitrogen is adsorbed by molecular sieve, oxygen is accumulated at the top of the adsorption tower into the oxygen storage tank, and then through the odor removal, dust removal filter and sterilization filter filter is qualified medical oxygen. The main components are: air tank, air compressor, cold drying machine, oxygen host, oxygen tank and so on.